<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>range</title>
  <link rel="stylesheet" href="layout.css">
</head>
<body>
年龄：<input type="range" value="0"><br>
你的年龄是：<span>0</span>&nbsp;岁
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<script src="main.js"></script>
</body>
</html>
